<?php

/**
 * Smarty plugin
 * @package Smarty
 * @subpackage plugins
 */
/**
 * read a cache file, determine if it needs to be
 * regenerated or not
 *
 * @param string $tpl_file
 * @param string $cache_id
 * @param string $compile_id
 * @param string $results
 * @return boolean
 */
//  $tpl_file, $cache_id, $compile_id, &$results
function smarty_core_read_cache_file(&$params, &$smarty) {
	static $content_cache = array();
	if($smarty->force_compile) {
		// force compile enabled, always regenerate
		return false;
	}
	if(isset($content_cache[$params['tpl_file'] . ',' . $params['cache_id'] . ',' . $params['compile_id']])) {
		list ($params['results'], $smarty->_cache_info) = $content_cache[$params['tpl_file'] . ',' . $params['cache_id'] . ',' . $params['compile_id']];
		return true;
	}
	if(! empty($smarty->cache_handler_func)) {
		// use cache_handler function
		call_user_func_array($smarty->cache_handler_func, array('read' , &$smarty , &$params['results'] , $params['tpl_file'] , $params['cache_id'] , $params['compile_id'] , null));
	} else {
		// use local cache file
		$_auto_id = $smarty->_get_auto_id($params['cache_id'], $params['compile_id']);
		$_cache_file = $smarty->_get_auto_filename($smarty->cache_dir, $params['tpl_file'], $_auto_id);
		$params['results'] = $smarty->_read_file($_cache_file);
	}
	if(empty($params['results'])) {
		// nothing to parse (error?), regenerate cache
		return false;
	}
	$_contents = $params['results'];
	$_info_start = strpos($_contents, "\n") + 1;
	$_info_len = (int) substr($_contents, 0, $_info_start - 1);
	$_cache_info = unserialize(substr($_contents, $_info_start, $_info_len));
	$params['results'] = substr($_contents, $_info_start + $_info_len);
	if($smarty->caching == 2 && isset($_cache_info['expires'])) {
		// caching by expiration time
		if($_cache_info['expires'] > - 1 && (time() > $_cache_info['expires'])) {
			// cache expired, regenerate
			return false;
		}
	} else {
		// caching by lifetime
		if($smarty->cache_lifetime > - 1 && (time() - $_cache_info['timestamp'] > $smarty->cache_lifetime)) {
			// cache expired, regenerate
			return false;
		}
	}
	if($smarty->compile_check) {
		$_params = array('get_source' => false , 'quiet' => true);
		foreach(array_keys($_cache_info['template']) as $_template_dep) {
			$_params['resource_name'] = $_template_dep;
			if(! $smarty->_fetch_resource_info($_params) || $_cache_info['timestamp'] < $_params['resource_timestamp']) {
				// template file has changed, regenerate cache
				return false;
			}
		}
		if(isset($_cache_info['config'])) {
			$_params = array('resource_base_path' => $smarty->config_dir , 'get_source' => false , 'quiet' => true);
			foreach(array_keys($_cache_info['config']) as $_config_dep) {
				$_params['resource_name'] = $_config_dep;
				if(! $smarty->_fetch_resource_info($_params) || $_cache_info['timestamp'] < $_params['resource_timestamp']) {
					// config file has changed, regenerate cache
					return false;
				}
			}
		}
	}
	$content_cache[$params['tpl_file'] . ',' . $params['cache_id'] . ',' . $params['compile_id']] = array($params['results'] , $_cache_info);
	$smarty->_cache_info = $_cache_info;
	return true;
}
/* vim: set expandtab: */
?>
